MySQL?? ???? ??? ?? ???? ???? ??
TOCONVERTRINGTOUPPERCAYORLOWERCASEINMYSQL, USETHEUPPER () andLOWER () functions.1.USEUPPER (str) TOCONVERTRINGTOUPPERCASE (? : SELECTUPPER ( 'hellowORLD') returnShellowld, OrApplyIttoOlumnLikeSelectUpper (OrapPlyIttoOlumnlikeSelectupper)
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MySQL? ??? ??? ??? ??????
OptimizetableIsusedToreOrganizephysicalStorageAndeAmunuedSpacate ateRlaGedELETIONSORUPDATES, ?? ininnodbandmyisAmtables; itrebuildSthetableByCopyingAnlylaTATA, DEFRAGSTORAGE, ???? indexStatics, reseto-incrementcountersomeca
Sep 03, 2025 am 05:54 AM
SQL? ?? ?? ?? ???? ???? ??? ??????
SQLServer?? ???? ?? ? ?? ?? ?? ??? ????? ?? SQL? ???????. ?? ??? ??? ????. 1. ?? ??? ?? ?? ? ?? ???? ???? ???? ??? ??? ? ??? ?????. 2. ?? ? ?? ???? ?? ? ??? ???? quotename ()? ???? ? ??? ???? ?????. 3. ?? ? ? ??? ?? ?? ???? ?? ????? execsp_executesql? ?????. 4. ?? ? SQL ?? print@sql? ?? ??? ? ? ????. ? ??? ??, ? ?? ??? ?? ???? ???? ? ??? ??? ?? ? ?? ??? ????? ????, ??? ?? ??? ??? ???? ??? ?? ?? ???? ?????.
Sep 03, 2025 am 05:47 AM
SQL? ???? ??? ???? ??
thextractedayfromadateinsql, useday () orextract (dayfrom ...)? ?? : mysqlsupportsbothday () andextract (), postgres qlandoracleSeextract (), sqlserverallowsday () OrdatePart (day, ...), andsqliteRequiresttrftime ( '%d', ...)
Sep 03, 2025 am 05:22 AM
phpmyadmin?? ?? ??? ???? ??
TOSETAUTOINCREMENTINPHMMYADMIN, INCREATINGANEWTABLE, DEFINEACOLUMN (? : ID), enableThea_icheckbox, andsetItasprimarykey.2.foranexistingtable, gotoStructure, clickchangeonthecolumn, checka_i, setAsprimary, andSeaMe.1.3
Sep 03, 2025 am 05:20 AM
??? ?? MySQL ?? ??? ????? ??
setInnodb_buffer_pool_sizeto70–80-80%ofram (? : 12Gon16gbram) ? ConconfigureInnodb_buffer_pool_instancesto1per1gbofbufferpool (? :, 8FOR12G); repykey_buffer_sizesmall (32–64m)? myiSamheavily? ???? ?? ?;
Sep 03, 2025 am 05:04 AM
MySQL?? ?? ??? ??? (CTE)? ???? ??
ActeIsDefinedUsingTheWithClauseandactSASATEMPORRESULTSETSTEFORASINGSETSETSTEFORASINGSTINGSTINGSTINGSTINGSTINGSTIMPOREARDERESTEFORASINGSOLEGELITERATERATINSLIKEAVERAGESALARY.3
Sep 03, 2025 am 04:15 AM
CSV ??? MySQL? ?? ?? ??
LoadDatainFile? ???? ?? CSV ??? MySQL? ?? ?? ?? ?? ?????. 1. CSV ??? ???? ???? MySQL ??? ??? ??? ????? ?? ??? ????? ??????. 2. CSV ??? ???? MySQL?? ???? ????. 3. LoadDatainFile ??? ???? ??? ???, ??? ? ? ??? ???? ??? ?? Local_Infile? ???????. 4. ??? ?? ? ?? LoadDataloCalInfile? ??????. ??, ??? ?? ??? phpmyadmin? ?? ?? ? ? ????. ?? ??, ?? ??, ??? ??, ?? ??? ? ?? ?????? ??? ???? ??? ??????.
Sep 03, 2025 am 04:11 AM
MongoDB?? ??? ??? ??
mongodbhandlesrelationshipsthroughschemadesignsteadofsql-stylejoins.
Sep 03, 2025 am 04:07 AM
SQL?? ? ???? ???? ??? ???? ??
? ???? ???? ??? ???? ??? ?????? ?? ???? ?? ????. mySQL??? CreateUser ??? ???? ???? ???? ??? ???? ?? ?? ??? ????? ????? ??????. PostgreSQL?? CreateUser ?? Createrole? ???? ???? ? ???? ??? Grant ?? ?? ??????, ??? ?? ???? ?? ????, ? ??? ????? ?? ?? ? ? ????. SQLServer?? ?? Createlogin? ???? ?? ?? ??? ??? ??? ?? CreateUser? ???? ???????? ?????? ???? ??? ??? ?? ?? ?? ?? ??? ?? ?? (? : ? : ? :)? ?? ??? ???????.
Sep 03, 2025 am 02:28 AM
SQL?? ??? ???? ??? ???? ??
USRety ... CatchBlockStotRaperRorsinStordProcedures
Sep 03, 2025 am 02:14 AM
MySQL?? ???? ???? ???
?? ??? ??? ??? ???? ??? ??? ???? MySQL?? ?? ??? ????? ?????. ?? ???? ??? ????? : ?? ??? ??? ???? ?? ?? ??? ?? ??? ???, ?? ?? ??? UTC? ????, ?? ?? ?? ??? ???, mysql_tzinfo_to_sql? ?? ??? ????????, ?? ? ?? ??? ???? ?? ??? ??? ?? ??? ????????, ??? ??? ?? ?? ??? ???? ????, ???? ????, ??? ?? ??? ????, ??? ??? ??, ?? stimest ???? ???? ??? ?????. ??? ???? ???? ????? ?? ??? ?? ??????? ???? ?????.
Sep 03, 2025 am 02:09 AM
Navicat vs Dbeaver : ?? ?? ?? ?????
NavicatisBetterforApolish, ??? ??? ? ??, whilebeaverexcelsincustomizationandsupportingawiderangeofdatabass.navicatoffersasleekinterfaceandrobustfeaturesydatabasemangagement, beenpen-source, furedexten
Sep 03, 2025 am 02:05 AM
SQL? ??? ?????? ??? ?? ??? ??????
mysql : selectDatabase (); returnsTheCurrentDataBasenameornUllifnoneisSelected.2.postgresql : selectCurrent_Database (); returnSthenameOfTheMurentyConnectedDatabase.3.sqlserver : selectDb_name (); ????? stelecurrent -sTABASENAME.4
Sep 03, 2025 am 01:57 AM
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